Blow moulding process represents a plastic shaping technique utilised to craft hollow items from thermoplastic materials. This method revolves around the warming and expansion of a plastic tube referred to as a "parison" or "preform." Positioned between two moulds that define the desired product's shape, the parison undergoes inflation by introducing air. This expansion thins out the walls of the tube, prompting them to assume the mould's contours. Subsequent to the blowing phase, the product is cooled, extracted from the mould, refined through trimming, and readied for subsequent processing stages.